I haven't tried them yet, but I'm looking here:
http://www.superbrightleds.com/cat/l...-1060--441630/
I have used LED off-road lights on my golf cart and I love how they are super bright and don't dim like the standard ones did when accelerating.
It also looks like they have LED's for just about every light on the car, kind of expensive, but figure that they will probably last a lifetime in a average use car, and maybe more than that for a seldom used classic.